Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b8a909fbe384a5…

MALICIOUS

PDF

84.1 KB Created: 2021-09-09 11:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5fbb06f897ee68ef856ae150f9fc82c4 SHA-1: 44373bb3060d551931b7357e652f97be68560158 SHA-256: 98b8a909fbe384a55ba4e27e8aee4d689f7c4003124404c0e77c30aaf1509ecf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farms indicates an effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=android+mini+pc+update PDF link annotation
    • https://seo-methodes.com/userfiles/file/52215660772.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/28584372156.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133625426dba---74939700278.pdfIn PDF document text
    • http://woykoff.hu/upload/file/niranewelisupopemap.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/zositikawebevigiji.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/jebijijon.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349d72b1ac8---77821254653.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109060227149743.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/sufodekobabosebejajig.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/11038297866.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/61964383537.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/4399290630.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317b06aadfb---pifegivakizoximiteka.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/bevedenagebaj.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/6104180282.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/97726195817.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/70715288152.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/zovowevenaninemotode.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/zefegosemovajuxaruvuso.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/26800833925.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/83830463938.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/54116282489.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/34282080798.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/27280829511.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/36014503030.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70D 16940 bytes
SHA-256: 2118eb2b02e134c73d782e6af29fd6519f53826935abe76ea26fd581963e5fda
font_01_sfnt_off000112f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B08 10540 bytes
SHA-256: aa265a114bc5e68b4d9fc635f13a29a08fb44bdeda4d44a5b08248e607143b64

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